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-rw-r--r--plugins/system_group/system_group.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/plugins/system_group/system_group.c b/plugins/system_group/system_group.c
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index 0000000..c43fc0c
--- /dev/null
+++ b/plugins/system_group/system_group.c
@@ -0,0 +1,144 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2010-2014 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif /* HAVE_STDBOOL_H */
+#include <string.h>
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <grp.h>
+
+#include "sudo_compat.h"
+#include "sudo_dso.h"
+#include "sudo_plugin.h"
+#include "sudo_util.h"
+
+/*
+ * Sudoers group plugin that does group name-based lookups using the system
+ * group database functions, similar to how sudo behaved prior to 1.7.3.
+ * This can be used on systems where lookups by group ID are problematic.
+ */
+
+typedef struct group * (*sysgroup_getgrnam_t)(const char *);
+typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
+typedef void (*sysgroup_gr_delref_t)(struct group *);
+
+static sysgroup_getgrnam_t sysgroup_getgrnam;
+static sysgroup_getgrgid_t sysgroup_getgrgid;
+static sysgroup_gr_delref_t sysgroup_gr_delref;
+static bool need_setent;
+
+static int
+sysgroup_init(int version, sudo_printf_t plugin_printf, char *const argv[])
+{
+ void *handle;
+
+ if (SUDO_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
+ plugin_printf(SUDO_CONV_ERROR_MSG,
+ "sysgroup_group: incompatible major version %d, expected %d\n",
+ SUDO_API_VERSION_GET_MAJOR(version),
+ GROUP_API_VERSION_MAJOR);
+ return -1;
+ }
+
+ /* Share group cache with sudo if possible. */
+ handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrnam");
+ if (handle != NULL) {
+ sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
+ } else {
+ sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
+ need_setent = true;
+ }
+
+ handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrgid");
+ if (handle != NULL) {
+ sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
+ } else {
+ sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
+ need_setent = true;
+ }
+
+ handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_gr_delref");
+ if (handle != NULL)
+ sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
+
+ if (need_setent)
+ setgrent();
+
+ return true;
+}
+
+static void
+sysgroup_cleanup(void)
+{
+ if (need_setent)
+ endgrent();
+}
+
+/*
+ * Returns true if "user" is a member of "group", else false.
+ */
+static int
+sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
+{
+ char **member;
+ struct group *grp;
+
+ grp = sysgroup_getgrnam(group);
+ if (grp == NULL && group[0] == '#' && group[1] != '\0') {
+ const char *errstr;
+ gid_t gid = sudo_strtoid(group + 1, &errstr);
+ if (errstr == NULL)
+ grp = sysgroup_getgrgid(gid);
+ }
+ if (grp != NULL) {
+ if (grp->gr_mem != NULL) {
+ for (member = grp->gr_mem; *member != NULL; member++) {
+ if (strcasecmp(user, *member) == 0) {
+ if (sysgroup_gr_delref)
+ sysgroup_gr_delref(grp);
+ return true;
+ }
+ }
+ }
+ if (sysgroup_gr_delref)
+ sysgroup_gr_delref(grp);
+ }
+
+ return false;
+}
+
+sudo_dso_public struct sudoers_group_plugin group_plugin = {
+ GROUP_API_VERSION,
+ sysgroup_init,
+ sysgroup_cleanup,
+ sysgroup_query
+};